Means for dressing grinding wheels



April 30, 1940. v E. .'|vn= '|-:so| 1 MEANS FOR DRESSING GRINDING WHEELS 2 Sheets-Sheet 1 Filed April 10, 1939 -April30,1940. E, L ME soy 2.199.053-

' 1 ME AI QS FOR DRESS ING GRINDING WHEELS Filed April 10,1939 'Z'Sheet-Sheet g Patented Apr. 30, 1940 PATENT orrica MEANS non DRESSING'GRINDING WHEELS Edwin Laurence Meeson, Coventry, England Appiication April 1c, 1939, Serial No. 267,108 In Great Britain .lianuary 18, 1939 4 Claims. (11125-11) This invention relates to an improved diamond tool for use in dressing the operative surface of grinding wheels and has for its object to increase the efiiciency of the tool and to maintain itin as its most efiicient' form.

For this purpose, according to the present invention, advantage is'taken of the rotarymotion of the grinding wheel during the dressing operation for automatically producing and maintainid' ing the preferred form of the diamond.

The invention consists in the provision of a diamond dressing tool which is free to rotate so that when the tool is traversed across the operative face of the rotating grinding wheel during 15 the dressing operation, the contact which is maintained between one side of the diamond and the wheel by the traversing motion of the tool will cause the said diamond to rotate continuously in one direction. Whatever the original shape of the point of the diamond tool may be the efiect produced by the dressing operation will be to form the diamond with a conical point and to maintain it in that form.

The rotatable part of the improved tool may 5 be mounted in anon-rotatable part in any suitable manner. The non-rotatable part of the tool is preferably mounted on the grinding machine so as to have a limited pivotal movement which v will allow the tool to be presented with its axis of rotation at any desired angle to the operative face of the grinding wheel.

In the accompanying drawings,

Figure 1 is a plan view showing the improved diamond dressing tool as arranged for dressing the peripheral surface of a grinding wheel.

Figure 2 is a similar view showing the application of the improved tool for use in dressing the side face of a grinding wheel.

Figure 3 is a plan view of a grinding machine illustrating one application oi the improved dressing tool.

Figure 4 is a longitudinal sectional view of the improved diamond dressing tool showing one type of bearing for the rotatable spindle. Referring to the drawings, a representsthe rotatable grinding wheel of any orthodox type of grinding machine.

The diamond tool I) employed for dressing the operative surface of the grinding wheel is carried by a spindle c which is free to rotate in a holder.

:1 adapted for mounting upon the grinding machine.

The diamond tool b may be mounted directly in the end of the spindle or, alternatively, it

as may be fixed in a separate mounting in the usual way and the latter detachably secured to the end of the spindle. In this latter case the spindle may be tubular so that a drift can be passed through it to force the mounting oi the end of the spindle. 5 The said spindle may be mounted on any ape propriate type of bearings in the holder d and is free to rotate therein in either direction. For example, the spindle a carrying the diamond b at one end may, as shown, in Figure 4 be mounted 1o on oil-tight ball bearings c mounted in the holder (1.

The holder at is closed at each end by plates at and d and the end of the spindle carrying the diamond tool is supported by a tubular extenl5 sion d of the plate d Where the wheel rotates about a fixed axis the said holder is mounted on the machine so as to have two movements, that is to say, a traversing movement across the operative face of the grind g0 ing wheel and a feed movement towards and away from said face. For example, as shown in Figure 3, the dressing tool comprising the holder (1 and the rotatable diamond b is pivotally mounted at e to a slide j which has a feed move- 5 mentin a direction towards and away from the wheela upon a second slide g which hasa traversing movement across the face of the said wheel upon the bed 72. of the machine. These motions can be produced in any well known manner, as 30 by means of the hand operated screws 1', A: respectively. Alternatively, the said slides can be operated automatically by mechanical, electrical, hydraulic or pneumatic power.

In the arrangement shown the dressing tool 5 is angularly adjustable about the axis of the pivot ein such a manner that the said tool can be presented to the operative face of the grinding wheel with its axis of rotation at any desired angle thereto. "o

It will now be seen that when the free ro ,tatable dressing tool is brought into operation on the face of the grinding wheel the contact which is maintained by the treversing motion of the tool between one side of the diamond and the ,5 shoulder formed on the rotating wheel bythe 7 feed of the tool will cause the diamond and its of the diamond is presented to the wheel will and the wheel is constantly and rapidly changed.

As is well known diamonds vary considerably in their original shape and in the cases where they offer a flat surface to the wheel the constant tendency for the diamond to rotate under the action of the wheel is to cause one of the edges of the fiat surface to act as an efllcient cutting edge until it is sufficiently worn to allow the diamond to rotate and to produce the desired conical form.

Regarded from another aspect the invention may be defined as a method of producing a conical point on the diamond tool of a grinding machine, said method consisting in mounting the said tool so as to be free to rotate and in traversing the same across the operative surface of the grinding wheel at such an angle thereto that the continuous rotation of the tool by the'wheel during the dressing operation will produce and maintain the required conical point.

I claim:

1; Dressing means for a rotatable grinding wheel comprising a carriage disposed for movement towards and away from said wheel, a spin-- dle holder mounted on said carriage, and a spindle freely rotatably joumalled in said holder for dle in axial alignment therewith so that movement of said carriage towards said grinding wheel brings the point and the side portion of said diamond into operative engagement with said wheel, whereby rotation of said wheel serves to rotate said diamond and continually sharpen and maintain the shape of the point thereof.

2. Dressing means for a rotatable grinding wheel comprising a spindle holder disposed ad- Jacent the grinding wheel, and a spindle freely rotatably journalled in said holder for rotation about an axis disposed at an acute angle .to the axis of rotation of said grinding wheel, in combination with a substantially cone shaped diamond carried at the end of said spindle and in axial alignment therewith to engage and be rotated by said wheel.

3. Dressing means for a rotatable grinding wheel comprising a cone shaped diamond mounted for rotation about its conical axis adjacent said wheel, said axis being disposed at an acute angle to the axis of said wheel, and the conical point and side of said diamond being in operative engagement with said wheel whereby rotation of said wheel serves to rotate said tool and to continually sharpen and maintain the shape of the conical point of the diamond.

4. The method of producing and maintaining a conical point on a diamond dressing tool for rotary grinding wheels comprising mounting said diamond for rotation about an axis disposed at an acute angle to the axis of said grinding wheel, rotating the grinding wheel and traversing the diamond across the face thereof while constantly maintaining said acute angle between the respective axis of rotation of said diamond and said grinding wheel, whereby rotation of said wheel serves to rotate said diamond to produce and maintain the desired conical point.

EDWIN LAURENCE MZEESON. 

